Recently, O’Reilly published the long awaited Network Warrior 2nd Edition by Gary Donahue (aka GAD).  This was a much anticipated update since technology has changed since the original publication back in 2007.  I am glad to see the inclusion of the Cisco ASA, Cisco Nexus, and IPv6, and Voice – as well as a few others.  Most (if not all) of the examples in the book are shown in different Cisco languages – CatOS, IOS, and also NX-OS.  These examples are great for helping the ready to understand and see the differences ( as well as the evolution ) of the codes.